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公开(公告)号：JPH04283397A
公开(公告)日：1992-10-08
申请号：JP4475391
申请日：1991-03-11
Applicant: MATSUSHITA REFRIGERATION
Inventor： KIDO OSAO
IPC: F28F1/40
Abstract: PURPOSE:To improve the performance of a heat-exchanger using the title conduit, by a method wherein on the title conduit used for the heat-exchanger transferring heat between a refrigerant used for an air-conditioner, a refrigerating apparatus, an automotive apparatus, or the like and a fluid, such as the air, the heat transfer rate between the refrigerant flowing in the title conduit and an inner surface therein is considerably improved. CONSTITUTION:By providing grooves 11 arranged without gaps in parallel to the axial direction n of the title conduit, at the top of an inner surface 8a therein, and by providing grooves 10 without gaps in inclining to the axial direction n thereof, at the bottom of the inner surface 8a therein; the heat transfer rate between the inner surface therein and a refrigerant is considerably improved since the effective area for transferring heat is greatly increased, and thus the performance of a heat-exchanger using the title conduit can be improved.
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公开(公告)号：JPH04184096A
公开(公告)日：1992-07-01
申请号：JP30746890
申请日：1990-11-13
Applicant: MATSUSHITA REFRIGERATION
Inventor： KIDO OSAO
Abstract: PURPOSE:To provide a substantial improvement over a heat transfer performance of a boiling heat transfer pipe by a method wherein a helical continuous groove is continuously formed in respect to an axial direction of a pipe, a welding part when the pipe is formed is also formed helically in respect to an axial direction of the pipe, and the groove and a welded projection projected toward an inner circumferential surface of the pipe at the welded part are always kept in parallel to each other at the inner circumferential surface of the pipe. CONSTITUTION:A boiling heat transfer pipe 11 is used as a part of a heat exchanger. Refrigerant during boiling stage is flowed in the pipe. At this time, a V-shaped groove 13 is helically formed at an inner circumferential surface 11a of the boiling heat transfer pipe 11 in respect to an axis (n) of the pipe. A welded projection 15 is also helically arranged in respect to a direction (n) of the pipe axis in such a way as it becomes in parallel with a continuous groove 13, thereby liquid refrigerant flowing at a bottom part of the pipe of a flow passage 12 of the horizontal boiling heat transfer pipe 11 is sufficiently sucked up within the groove 13 under a capillary phenomenon and a guide of the welded projection 15, resulting in that the entire inner circumferential surface 11a of the pipe is wetted by a thin refrigerant liquid film and a heat transferring performance is substantially improved due to an increased effective heat transfer area as well as the thin refrigerant liquid film flow. At this time, the welded projection 15 does not become a trouble against the liquid refrigerant flow, but rather it becomes a guide for guiding a helical flow and so the pressure loss may not be increased.
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公开(公告)号：JPH04126998A
公开(公告)日：1992-04-27
申请号：JP24773790
申请日：1990-09-17
Applicant: MATSUSHITA REFRIGERATION
Inventor： KIDO OSAO , NAKAYAMA KOICHI
IPC: F28F1/40
Abstract: PURPOSE:To improve heat transfer performance by continuously providing a plurality of oblique grooves in a direction at a predetermined slope to a tube axial direction and a plurality of parallel grooves in a direction parallel to the axial direction in a crossing state on the inner periphery of a tube. CONSTITUTION:Oblique grooves 10 are continuously formed in a direction at a predetermined slope to a direction of a tube axis (n) and parallel grooves 11 are formed in a direction parallel with the direction of the axis (n) on the inner periphery 8a of a boiling heat transfer tube 8. In refrigerant flowing in a passage 9 in the tube, liquid refrigerant flowing to the bottom of the tube is pulled up by a capillary tube phenomenon in an area having a relatively small flowing speed to increase its effective heat transfer area. Since the grooves 10, 11 are provided, liquid refrigerant holding amount is much, the liquid refrigerant flow is obtained along the grooves 10, 11 not only in a high dryness area but in much liquid refrigerant area with relatively low dryness area to sufficiently obtain heat transfer acceleration effect. In the area having large refrigerant flowing speed, the liquid refrigerant flow along the grooves 11 is more than that flowing along the oblique groove 10, the thickness of the liquid refrigerant is made uniformly thin by the capillary tube mainly with the grooves 11 to accelerate its heat transfer.
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公开(公告)号：JPH0490500A
公开(公告)日：1992-03-24
申请号：JP20611590
申请日：1990-08-02
Applicant: MATSUSHITA REFRIGERATION
Inventor： KIDO OSAO , NAKAYAMA KOICHI
IPC: F28F1/40
Abstract: PURPOSE:To make a substantial improvement of an inter-pipe heat transfer rate from a low drying degree zone of refrigerant to a high drying degree zone by a method wherein may substantial diamond-form recesses having a specified depth are provided at an inner circumferential surface and diagonal directions of the substantial diamond-form recesses are disposed to be in a helical direction with respect to an axis of a pipe. CONSTITUTION:Substantial diamond-form recesses 10 are disposed at an inner circumferential surface 8a of an evaporative heat transfer pipe 8 in such a way as a diagonal line direction D of the substantial diamond shape is in a helical shape with respect to an axis of the pipe. Liquid refrigerant flowing at a bottom part of the pipe of a flow passage 9 of the horizontal evaporating heat transmitting pipe 8 is sucked up by a capillary action of the recesses 10, resulting in that an effective heat transfer area of the inner circumferential surface 8a contacting with the liquid refrigerant is increased, so that an inter-pipe heat transfer rate can be improved. In addition, even at an area where a evaporating initial period, i.e., a low drying degree area to a middle drying degree region is applied for a large amount of liquid refrigerant, it is possible to get a flow of main liquid refrigerant along the diagonal line direction of the diamond of each of the recesses 10. Due to this fact, not only the high drying degree region, but also from the low drying degree region to the middle drying degree region, the flowing state can maintain a circulating flow and then an inter-pipe heat transfer rate can be improved over a full drying degree region due to an increased effective heat transfer rate.
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公开(公告)号：JPH02197796A
公开(公告)日：1990-08-06
申请号：JP1545289
申请日：1989-01-25
Inventor： KIDO OSAO , KASE HIROAKI , NAKAMURA TAKASHI , AOKI AKIRA , AOYANAGI OSAMU
IPC: F28F1/32
Abstract: PURPOSE:To permit the falling of water drips from gaps between flat tubes to a lower stage along the draining surface of a flat plate fin even when a heat exchanger is used as an evaporator and the water drips are produced by condensation and are adhered to the outer surface of the heat exchanger by a method wherein draining surfaces, pinched by flat groove provided at the side of a fore rim and the same provided at the side of an aft rim, are provided on the surface of the flat plate fin while the flat tubes are divided by the draining surface utilizing it as a boundary. CONSTITUTION:A heat exchanger is constituted of flat plate fins 7, provided with a plurality of stages of flat grooves 8 constituted by notching both ends of fore and aft rims, and flat tubes 1, inserted from side surfaces into the flat grooves 8 of the flat plate fins 7 arranged in parallel to each other with a given fin pitch Pf, and is provided with draining surfaces 9, pinched by a fore rim side flat groove 8f and aft rim side flat grooves 8r, on the flat plate fins 7 while the flat tubes 11 are divided by the draining surface 9 utilizing it as a boundary. When the finned heat exchanger is used as an evaporator and water drips L adhered to the outer surface of the heat exchanger by condensation, the water drips L may be dropped to a lower stage through the gaps (w) between the divided flat tubes 11 along the draining surface 9 of the flat fins 7. Accordingly, the increase of the ventilating resistance of air stream A as well as the deterioration of heat transfer rate may be restrained.
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Patent Agency Ranking
公开(公告)号：JPH02166393A
公开(公告)日：1990-06-27
申请号：JP31910988
申请日：1988-12-16
Inventor： KIDO OSAO , KASE HIROAKI , NAKAMURA TAKASHI , AOKI AKIRA , AOYANAGI OSAMU
Abstract: PURPOSE:To make the downflow of water drops good even when they condense on the outer surface and prevent the increase in the draft resistance of air flow and decrease in the coefficient of heat transfer by providing a water drainage face which communicates among flat plate fins in the direction of the steps on the downstream side surface by means of a flat groove of a flat plate fin. CONSTITUTION:A heat exchanger consists of a flat plate fin 7 which is provided with a plurality of steps of flat groove 8 which is constituted by cutting the front edge side in the air flow direction A of the fin 7 and a flat pipe 11 which is inserted into the flat groove 8 from the side face of the flat plate fin 7. A water drainage face 9 which communicates among the flat plate fins 7 in the direction of the steps is provided on the downstream side face that is downstream of the flat grooves 8 of the flat fin 7. When this heat exchanger with the fin is used as an evaporator and water drops condense on the outer faces, the water drops staying on the upper face of a flat pipe 11 are pushed by the air flow A and move to the downstream side and follows the water drainage faces 9 that communicate with each other in the direction of the steps. Accordingly it is possible to make good the fall of the water drops and suppress the increase in the draft resistance of the air flow A and decrease in the coefficient of heat transfer.
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公开(公告)号：JPH02154987A
公开(公告)日：1990-06-14
申请号：JP30804288
申请日：1988-12-06
Inventor： KIDO OSAO , KASE HIROAKI , NAKAMURA TAKASHI , AOKI AKIRA , AOYANAGI OSAMU
Abstract: PURPOSE:To permit the restriction of the ventilating resistance of airflow as well as the improvement of heat exchanging capacity by a method wherein the title heat exchanger is constituted of flat plate fins, provided with a plurality of stages of flat grooves, notched at both ends of the rims, and hollow flat tubes, inserted into the flat grooves from the side surface thereof and enclosed by long sides and short sides, while the thickness of the flat tube in the direction of the short sides thereof and a pitch in the direction of the steps are specified. CONSTITUTION:Flat tubes 10, inserted into and adhered to the flat grooves 8 of flat plate fins 7 from the side surfaces thereof, are constituted of long sides 10a, short sides 10b and partitioning plates 10c, dividing the inside of the pipes, while a plurality of the flat tubes are arranged with a pitch Pd so that the long sides 10a of the flat tubes 10 are arranged in parallel to the direction of airflow A. The thickness (t) in the direction of the short sides 10b of the flat tube 10 is specified within 1-3mm while the pitch Pd is specified within 8-12mm. According to this method, the density of the flat tube 10 and the flat plate fin 7 may be increased and the remarkable increase of heat exchanging capacity as well as the peak point thereof may be obtained while the increase of the ventilating resistance of airflow, which is generated by the increase of the density of the flat tube 10 and the flat plate fin 7, may be restrained by the employment of thin type flat tubes 10.
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公开(公告)号：JPH02133797A
公开(公告)日：1990-05-22
申请号：JP28800088
申请日：1988-11-15
Inventor： KIDO OSAO , KASE HIROAKI , NAKAMURA TAKASHI , AOKI AKIRA , AOYANAGI OSAMU
IPC: F28F1/32
Abstract: PURPOSE:To improve heat exchanging capability to a great extent while controlling the air flow resistance of an air stream by a method wherein a thickness measured in the direction of the shorter side of a flat tube and a pitch taken in the direction of the stage of the flat tubes formed into a plurality of stages so as to be in parallel with one another in the direction of the longer side of said flat tubes are limited to a specific range. CONSTITUTION:Each of flat tubes 10 closely inserted into oblong holes 8 provided in a plurality of plate fins 7 arrayed in parallel at predetermined intervals is constituted to have the longer side 10a, the shorter side 10b and partition plates 10c dividing the inside of the flat tube 10. The flat tubes 10 are provided in the form of a plurality of stages at a stage pitch Pd so that the longer side 10a of each of the flat tubes 10 is in parallel with the direction of an air stream A. Headers 11 connected to both ends of the flat tube 10 constitute an in-tube flow path for refrigerant R together with the flat tube 10. Further, a thickness (t) made in the direction of the shorter side 10b of the flat tube 10 is suitably set to a range of 1 to 3mm, and the stage pitch Pd to a range of 8 to 12mm. By adapting such flat tubes 10, the air flow resistance of the air stream A can be reduced, and the high densification of the flat tubes 10 and plate fins 7 also becomes possible. Thus, heat exchanging capability can be improved to a great extent by the increase of heat transfer area, the enhancement of heat transfer coefficient and the improvement of the efficiency of the fins.
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公开(公告)号：JPH0284251A
公开(公告)日：1990-03-26
申请号：JP14426588
申请日：1988-06-10
Inventor： AOKI AKIRA , NAKAMURA TAKASHI , AOYANAGI OSAMU , KIDO OSAO , KASE HIROAKI
Abstract: PURPOSE:To supply the heat exchanger tube whose wall thickness is thin and whose height is low and to improve the pressure resisting performance and the heat transfer performance by forming plural pieces of passages by depositing plural pieces of prescribed thin tubes at a prescribed interval between two pieces of metallic plates which are placed in parallel to each other. CONSTITUTION:The heat exchanger tube is constituted by laminating plural pieces of thin tubes 3 made of a metal at a prescribed interval between two pieces of long-sized plate materials 1a, 1b made of a metal which are placed in parallel to each other in the upper and the lower parts and depositing the plate materials 1a, 1b and the thin tubes 3. Therefore, height of the heat exchanger tube can also be made low, and the heat exchanger tube whose height is
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公开(公告)号：JPH01234764A
公开(公告)日：1989-09-20
申请号：JP5878988
申请日：1988-03-11
Applicant: MATSUSHITA REFRIGERATION
Inventor： IDE SHINICHI , KIDO OSAO
IPC: F25B41/00
Abstract: PURPOSE:To obtain the stable mass flow diversion ratio of a refrigerant, without being affected by the shape of a branch part, by providing the title device comprising a discharge pipe having a plurality of outlet ports, an introduction pipe communicating to the substantially central part of the discharge pipe, and an inlet pipe welded to the introduction pipe, and by forming the tip end of the inlet pipe into a nozzle shape. CONSTITUTION:A refrigerant 17 is in the form of a two-phase flow consisting of a vapor phase portion 17a and a liquid phase portion 17b. In an inlet pipe 13a, the vapor phase portion 17a which is light in specific gravity and the liquid phase portion 17b which is heavy in specific gravity are separated from each other so that the vapor phase portion 17a flows through the upper part of the inlet pipe 13a and the liquid phase portion 17b flows through the lower part thereof. Then, the refrigerant 17 advances toward the nozzle-shaped part of the inlet pipe 13a, and at this part, the vapor phase portion 17a and the liquid phase portion 17b, which have been separated from each other, are mixed with each other, so that a flow speed increases and the influence of gravity 18 is reduced, whereby the mass flow diversion ratio of the refrigerant 17 at the respective upper and lower parts of a discharge pipe 14 is equalized. As the refrigerant 17 does not impinge against a branch part 19, the stable mass flow diversion ratio is obtained without being affected by irregularity in the shape of the branch part 19.
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